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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2009

Influence of the anisotropy on zero-group velocity Lamb modes

Résumé

Guided waves in a free isotropic plate ͑symmetric S n and antisymmetric A n Lamb modes͒ exhibit a resonant behavior at frequencies where their group velocity vanishes while their phase velocity remains finite. Previous studies of this phenomenon were limited to isotropic materials. In this paper, the optical generation and detection of these zero-group velocity ͑ZGV͒ Lamb modes in an anisotropic plate is investigated. With a circular laser source, multiple local resonances were observed on a silicon wafer. Experiments performed with a line source demonstrated that the frequency and the amplitude of these resonances depend on the line orientation. A comparison between experimental and theoretical dispersion curves for waves propagating along the ͓100͔ and ͓110͔ directions of the silicon crystal verified that these resonances occur at the minimum frequency of the S 1 and A 2 Lamb modes. Simulations indicated that it is possible to deduce the three elastic constants of the plate material with good accuracy from these measurements.
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Dates et versions

hal-04001316 , version 1 (22-02-2023)

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Claire Prada, Dominique Clorennec, Todd W Murray, Daniel Royer. Influence of the anisotropy on zero-group velocity Lamb modes. Journal of the Acoustical Society of America, 2009, 126 (2), pp.620-625. ⟨10.1121/1.3167277⟩. ⟨hal-04001316⟩
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